test: extend coverage of vfsFifoTest
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dualfroz committed
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@@ -160,3 +160,162 @@ KTEST(vfsUnlinkOnNeverOpenedFifoReclaimsPipeSlot)
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vfsUnlink(paths[i]);
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}
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/*
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* Coverage for PERSISTENT named pipes: vfsMkfifo under "/mnt" now creates a
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* real, on-disk sfs.h entry (sfsTypeFifo) instead of being rejected, so the
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* special file itself -- unlike everything above, which lives only in this
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* process's kmalloc heap -- survives sfsUnmount()+sfsMount(). The live
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* pipe.h byte stream two openers exchange data through is still purely
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* in-memory (vfs.c's sfsFifoHandleFor), created lazily on first open, since
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* buffered bytes never persist across a real mkfifo(2)'s reboot either --
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* only the rendezvous point's name and type do. Every test below starts
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* with its own sfsFormat() (same discipline sfsTest.c uses) so results
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* never depend on whatever an earlier test (here or in sfsTest.c, same
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* boot, same disk) left behind.
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*/
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KTEST(sfsBackedMkfifoCreatesPersistentFifoVisibleViaStat)
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{
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KT_TRUE(t, sfsFormat());
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KT_EQ(t, vfsMkfifo("/mnt/fifoBasic"), 0);
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FbStat st;
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KT_EQ(t, vfsStat("/mnt/fifoBasic", &st), 0);
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KT_EQ(t, st.type, fsTypeFifo);
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KT_EQU(t, st.size, 0u);
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/* Same path again must fail, exactly like the tmpfs case above. */
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KT_EQ(t, vfsMkfifo("/mnt/fifoBasic"), -1);
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KT_EQ(t, vfsUnlink("/mnt/fifoBasic"), 0);
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KT_EQ(t, vfsStat("/mnt/fifoBasic", &st), -1);
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}
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KTEST(sfsBackedFifoRendezvousByPathAloneNoSharedHandle)
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{
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KT_TRUE(t, sfsFormat());
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KT_EQ(t, vfsMkfifo("/mnt/fifoRendezvous"), 0);
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int rfd = vfsOpen("/mnt/fifoRendezvous", oReadOnly);
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KT_GE(t, rfd, 0);
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/* Nobody has opened the write end yet: "try again" (-1), never spurious
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end-of-file, exactly like the tmpfs fifo and a freshly
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pipeCreateDetached handle both already guarantee. */
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char probe[4];
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KT_EQ(t, vfsRead(rfd, probe, sizeof(probe)), -1);
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KT_NOTNULL(t, vfsBlockingChannel(rfd, false));
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int wfd = vfsOpen("/mnt/fifoRendezvous", oWriteOnly);
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KT_GE(t, wfd, 0);
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KT_NE(t, rfd, wfd);
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KT_EQ(t, vfsWrite(wfd, "hi", 2), 2);
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char buffer[4];
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memset(buffer, 0, sizeof(buffer));
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KT_EQ(t, vfsRead(rfd, buffer, sizeof(buffer)), 2);
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KT_TRUE(t, memcmp(buffer, "hi", 2) == 0);
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vfsClose(rfd);
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vfsClose(wfd);
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KT_EQ(t, vfsUnlink("/mnt/fifoRendezvous"), 0);
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}
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KTEST(sfsBackedFifoUnlinkWhileOpenLeavesLiveFdsWorking)
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{
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KT_TRUE(t, sfsFormat());
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KT_EQ(t, vfsMkfifo("/mnt/fifoUnlinkLive"), 0);
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int rfd = vfsOpen("/mnt/fifoUnlinkLive", oReadOnly);
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int wfd = vfsOpen("/mnt/fifoUnlinkLive", oWriteOnly);
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KT_GE(t, rfd, 0);
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KT_GE(t, wfd, 0);
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/* Real unlink-while-open semantics, same guarantee as the tmpfs fifo:
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removing the directory entry must not disturb fds opened before the
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unlink -- they keep working off their own copy of the raw pipe
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handle number. */
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KT_EQ(t, vfsUnlink("/mnt/fifoUnlinkLive"), 0);
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FbStat st;
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KT_EQ(t, vfsStat("/mnt/fifoUnlinkLive", &st), -1);
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KT_EQ(t, vfsWrite(wfd, "ok", 2), 2);
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char buffer[4];
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memset(buffer, 0, sizeof(buffer));
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KT_EQ(t, vfsRead(rfd, buffer, sizeof(buffer)), 2);
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KT_TRUE(t, memcmp(buffer, "ok", 2) == 0);
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vfsClose(rfd);
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vfsClose(wfd);
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}
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KTEST(sfsBackedFifoEntryPersistsAcrossUnmountRemount)
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{
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KT_TRUE(t, sfsFormat());
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KT_EQ(t, vfsMkfifo("/mnt/fifoPersist"), 0);
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/* The real point of this test (mirrors sfsTest.c's own
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sfsMountReloadsExistingFilesystem-style coverage): drop EVERY
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in-memory sfs.c structure (bitmaps, superblock) and reconstruct them
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purely from what sfsFormat/sfsCreateFifo actually wrote to disk --
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proving the fifo is a genuine on-disk entry, not a kmalloc node that
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would evaporate the instant this process's heap did (like the tmpfs
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fifo above, which vfsMkfifo("/mnt/...") deliberately never was). */
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sfsUnmount();
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KT_TRUE(t, sfsMount());
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FbStat st;
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KT_EQ(t, vfsStat("/mnt/fifoPersist", &st), 0);
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KT_EQ(t, st.type, fsTypeFifo);
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/* Still fully functional after the remount, not just present in a
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directory listing: a fresh open/write/read round trip works exactly
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as it would have before the remount. */
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int rfd = vfsOpen("/mnt/fifoPersist", oReadOnly);
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int wfd = vfsOpen("/mnt/fifoPersist", oWriteOnly);
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KT_GE(t, rfd, 0);
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KT_GE(t, wfd, 0);
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KT_EQ(t, vfsWrite(wfd, "yo", 2), 2);
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char buffer[4];
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memset(buffer, 0, sizeof(buffer));
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KT_EQ(t, vfsRead(rfd, buffer, sizeof(buffer)), 2);
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KT_TRUE(t, memcmp(buffer, "yo", 2) == 0);
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vfsClose(rfd);
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vfsClose(wfd);
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KT_EQ(t, vfsUnlink("/mnt/fifoPersist"), 0);
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}
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KTEST(sfsBackedFifoReopenAfterCompletedRoundTripGetsFreshWorkingSession)
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{
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/* Ordinary fifo usage, not a corner case: open both ends, exchange
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data, close both, then reopen the SAME persistent path later for a
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second, unrelated conversation -- exactly what a real named pipe is
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for. The first round trip fully releases pipe.h's underlying slot
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back to its general pool (pipeReleaseIfUnused, once both readers and
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writers hit 0), so the second round's vfs.c-level binding
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(sfsFifoHandleFor) MUST detect that its remembered handle number no
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longer refers to the same pipe (pipeIncarnation, pipe.h) and mint a
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genuinely fresh one -- otherwise this second write would silently
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target a slot nobody has attached to (or, worse, one some unrelated
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pipe elsewhere in the kernel grabbed in between), and would report
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-1 forever instead of actually delivering the byte. */
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KT_TRUE(t, sfsFormat());
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KT_EQ(t, vfsMkfifo("/mnt/fifoRoundTrip"), 0);
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int rfd1 = vfsOpen("/mnt/fifoRoundTrip", oReadOnly);
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int wfd1 = vfsOpen("/mnt/fifoRoundTrip", oWriteOnly);
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KT_GE(t, rfd1, 0);
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KT_GE(t, wfd1, 0);
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KT_EQ(t, vfsWrite(wfd1, "one", 3), 3);
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char first[4];
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memset(first, 0, sizeof(first));
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KT_EQ(t, vfsRead(rfd1, first, sizeof(first)), 3);
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KT_TRUE(t, memcmp(first, "one", 3) == 0);
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vfsClose(rfd1);
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vfsClose(wfd1);
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/* Second, independent session on the same path. */
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int rfd2 = vfsOpen("/mnt/fifoRoundTrip", oReadOnly);
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KT_GE(t, rfd2, 0);
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